Skip major upgrade for standby clusters with warning

Author: hughcapet

pkg/cluster/majorversionupgrade.go

@@ -145,6 +145,11 @@ func (c *Cluster) majorVersionUpgrade() error {
 	for i, pod := range pods {
 		ps, _ := c.patroni.GetMemberData(&pod)
 
+		if ps.Role == "standby_leader" {
+			c.logger.Errorf("skipping major version upgrade for %s/%s standby cluster. Re-deploy standby cluster with the required Postgres version specified", c.Namespace, c.Name)
+			return nil
+		}
+
 		if ps.State != "running" {
 			allRunning = false
 			c.logger.Infof("identified non running pod, potentially skipping major version upgrade")